The MD-100A8X is a wonderful addition to my FT-897D. It has nice audio to it and allows my hands to remain free during nets so I can copy and write down information. It is aesthetically pleasing and can be used with either the Yaesu 8-pin din plug or the RJ-45 variety.
This microphone was not made for the FT-897D, but can be used with it. According to Yaesu's tech support, you have to set the Main Filter switch on the bottom of the base in the Thru position. After setting the ALC with this mic, I was getting bad audio reports. I called Yaesu and almost sent it in for repair when the tech asked what position it was in. I told him and he advised that for this rig, it needs to be in the Thru position. Once I put it there and re-adjusted the ALC, I started getting good audio reports.